基于非線性動力學(xué)確定端承樁單樁豎向承載力
賀廣零1，洪芳2，李倩妹3
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(1 同濟(jì)大學(xué)建筑工程系，上海 200092； 2 福建工程學(xué)院土木工程系， 福州 350007；3 中南林業(yè)科技大學(xué)土木建筑與力學(xué)學(xué)院， 長沙 410004)［摘要］灌注混凝土端承樁的豎向承載力確定方法較多，但沒有一種有足夠說服力的確定方法。從端承樁的本構(gòu)關(guān)系具有突變性出發(fā)，基于非線性動力學(xué)的基本理論，獲得了單樁承載力的確定方法，并給出了延性破壞和脆性破壞的界定標(biāo)準(zhǔn)。以上海某工程為例，將計算值與試驗值比較，二者吻合較好，證明了用非線性動力學(xué)方法分析單樁豎向承載力是可行且高效的。為進(jìn)一步研究灌注混凝土端承樁豎向承載力和制定相關(guān)規(guī)范提供了參考。［關(guān)鍵詞］豎向承載力；非線性動力學(xué)；穩(wěn)定性；端承樁Determination of single end bearing pile vertical capacity based on nonlinear dynamic theoryHe Guangling1，Hong Fang2，Li Qianmei3(1 Dep.of Building Eng.,Tongji Univ.,Shanghai 200092,China;2 Dep.of Civil Eng.,Fujian Univ. of Tech.,Fuzhou 350007,China;3 College of Architecture Eng. & Mechanics,Central South Univ. of Forestry & Tech.,Changsha 410004,China)Abstract:Though several theories have been introduced to determine the vertical capacity of cast-in-place end bearing pile, none of them is persuasive enough as many factors are not easy to decide, such as it is extremely difficult to distinguish ductility failure and brittle failure of end bearing pile in reality. Based on the catastrophe character of its constitutive relation, the vertical capacity of end bearing pile and the criteria to differentiate the two kinds of failure are determined though the nonlinear dynamic theory. Take an engineering project of Shanghai for example, the calculated data and experimental data agree well with each other, showing that determining the vertical capacity of end bearing pile with the nonlinear dynamic theory is available and effective. It is useful for the further research of the pile vertical capacity and designing of relevant codes.Keywords:vertical capacity; nonlinear dynamic; stability; end bearing pile*國家自然科學(xué)基金委創(chuàng)新研究群體資助項目(50321803，50621062)。
